"Originally: the weaning of a child or other young mammal. In later use also: suppression or cessation of lactation", Late 15th cent.; earliest use found in Speculum Sacerdotale. From post-classical Latin ablactation-, ablactatio process of weaning (Vulgate) from ablactat-, past participial stem of ablactare + classical Latin -iō: see -ation.[ablactation etymology, ablactation origin, 英语词源]